XLogic G Series Compressor Owner s Manual

XLogic G Series Compressor Owner s Manual

Solid State Logic G SERIES COMPRESSOR Super-Analogue Outboard Owner s Manual 82S6XL050C

XLogic G Series Compressor Owner s Manual Solid State Logic Begbroke, Oxford, England, OX5 1RU +44 (0)1865 842300 320 West 46th Street, 2nd Floor, New York, NY 10036, USA +1 (1) 212 315 1111 Suite 401, 5757 Wilshire Blvd, Los Angeles, CA 90036, USA +1 (1) 323 549 9090 3-55-14 Sendagaya, Shibuya-Ku, Tokyo 151-0051, Japan +81 (0)3 5474 1144 7 bis, rue de la Victoire, le Blanc Mesnil, Paris 93150, France +33 (0)1 48 67 84 85 Via Timavo 34, 20124 Milano, Italy +39 (0)39 2328 094 Visit SSL at URL: http://www.solid-state-logic.com Solid State Logic All Rights reserved under International and Pan-American Copyright Conventions Solid State Logic, SSL and XLogic are trademarks of Solid State Logic All other product names and trademarks are the property of their respective owners No part of this publication may be reproduced in any form or by any means, whether mechanical or electronic, without the written permission of Solid State Logic, Oxford, England Revision 0A, September 2003 Revision 0B, January 2004 Revision 0C, June 2004 Minor changes, November 2004 Minor changes, June 2005 As research and development is a continual process, Solid State Logic reserves the right to change the features and specifications described herein without notice or obligation E&OE

XLogic G Series Compressor Definitions Maintenance All maintenance must be carried out by fully trained personnel. Note: it is advisable to observe suitable ESD precautions when maintenance to any part is undertaken. Non-User Adjustments Adjustments or alterations to the equipment may affect the performance such that safety and/or international compliance standards may no longer be met. Any such adjustments must therefore only be carried out by fully trained personnel. Users This equipment is designed for use solely by engineers and competent operators skilled in the use of professional audio equipment. Environment This product is a class A product intended to form an integrated component part of a professional audio recording, mixing, TV, radio broadcast or similar studio wherein it will perform to specification providing that it is installed according to professional practice. Page 1

Front Panel Meter shows gain reduction THRESHOLD - continuously variable from -15dB to +15dB Power Input Module A TTA CK - six switchable ranges - 0.1, 0.3, 1, 3, 10, and 30 msec. Earth lift switch Compression RATIO - three switchable ranges - 2:1, 4:1, and 10:1 REMOTE connector allows connection of external meter and Autofade switch Gain MAKE-UP to compensate for compressor action - continuously variable from -5dB to +15dB RELEASE - five switchable ranges - 0.1, 0.3, 0.6, 1.2 Sec., and 'Auto' - (Release Time dependant upon the duration of the signal peak) KEY INPUT (External side-chain audio) connector AUTOFADE facility with RATE continuously variable from 1 to 60 Sec. Compressor and Side- Chain IN/OUT XLR INPUT and OUTPUT connectors for left and right channel audio signals XLogic G Series Compressor Owner s Manual Page 2

General Description 1. General Description The XLogic G Series Compressor is a stand-alone unit which provides high quality stereo compression, giving the operator critical control over the dynamic range of audio signals. It is designed to combine the features of SSL G Series Consoles in such a way as to allow interfacing and use in a wide range of different applications. The unit is packaged in a 1U high 19" rack-mounted case. The depth of the case (excluding rear panel connectors) is 325mm (13"). Input and Output connections are all made via XLR Connectors on the rear panel. Power requirement for the unit is 100, 120, or 230V ac., connection being via the rear panel Power Input Module. Section 3 of this manual describes the procedure for setting the Power Input Module for different operating voltages. The main controls and facilities of the XLogic G Series Compressor are summarised and shown opposite. Front panel switches allow the compressor and external side-chain signals to be switched IN or out of circuit. The AUTOFADE switch enables an automatic fade out of a duration set by the RATE control. When the AUTOFADE switch is released, the stereo signal will fade back up over the set time. IMPORTANT Before powering up the unit, check that the correct fuse is fitted and that the voltage selection setting corresponds to the available Mains Supply. Adjust if necessary, following the procedure described in Section 3 of this manual. The XLogic G Series Compressor is supplied with the following accessories: IEC Mains Cable Owner's Manual Warranty The warranty period for this unit is 12 months from date of purchase. In Warranty Repairs In the event of a fault during the warranty period the unit must be returned to your local distributor who will arrange for it to be shipped to Solid State Logic for repair. All units should be shipped to Solid State Logic in their original packaging. Solid State Logic can not be held responsible for any damage caused by shipping units in other packaging. In such cases Solid State Logic will return the unit in a suitable box, which you will be charged for. Please do not send manuals, power leads or any other cables - Solid State Logic can not guarantee to return them to you. Please also note that warranty returns will only be accepted as such if accompanied by a copy of the receipt or other proof of purchase. Out of Warranty Repairs In the event of a fault after the warranty period has expired, return the unit in its original packaging to your local distributor for shipment to Solid State Logic. You will be charged for the time spent on the repair (at Solid State Logic's current repair rate) plus the cost of parts and shipping. Page 3

XLogic G Series Compressor Owner s Manual Simplified Block Diagram of the XLogic G-Series Compressor Audio Input (Left) Audio Input (Right) KEY Audio Input MAIN VCA CONTROL VOLTAGE Rectification and Peak Detection circuitry SIDECHAIN VCA CONTROL VOLTAGE Audio Output (Left) Audio Output (Right) Page 4

Specification 2. Specifications Input Impedance: 20KΩ Electronically balanced Output Impedance: < 40Ω Electronically balanced Frequency Response: 20Hz to 20kHz ± 0.2dB Max. Output: +24dBu Above 0 dbu, at onset of clipping. (0.1 % THD) Noise: < 85dBu (-90dBu typical) R.M.S. 20Hz to 22kHz measured at output, input terminated with 50 Ohm resistor. THD + N: < 0.004 % RMS 20Hz to 22kHz At +6 dbu, 1 khz. Crosstalk: < 95dB Below +20 dbu. (at 20 khz.) Measured at output of undriven channel, input terminated with 50 Ohm resistor. Key Input Impedance: 20KΩ XLR Electronically balanced RATIO: 1:2, 1:4, 1:10 ATTACK: RELEASE: THRESHOLD: MAKE-UP: AUTOFADE: Compression Meter: REMOTE Connector: 0.1, 0.3, 1, 3, 10, 30 msec. 0.1, 0.3, 0.6, 1.2 Sec., plus AUTO 15 to +15dB 5 to +15dB 1 to 60 Sec. Moving Coil, 0-20 db gain reduction Autofade switch, external gain reduction meter Note: 0dBu corresponds to a signal level of 0.775V rms. Page 5

XLogic G Series Compressor Owner s Manual 3. Checking Operating Voltage and Fuse Note: Before attempting to apply power to the unit, check that the correct fuse has been installed and that the operating voltage setting is correct. If necessary, adjust as described below. Fuse Selection and Replacement The XLogic G Series Compressor is supplied configured for single-fuse ('Live/Line' only) operation. The appropriate fuse must be fitted 1A for 100/120V operation, 0.5A for 230V operation. Operating Voltage Selection The XLogic G Series Compressor is not fitted with an auto-ranging power supply and the input setting must be confirmed before applying power. The input module can be configured to be one of 4 voltage settings. The setting is indicated by a plastic pin protruding through the appropriate hole in the fuse panel. The setting is altered by a small vertical PCB which can be fitted in 4 positions. To change the setting: i) Switch off and remove the IEC lead. ii) iii) iv) Using a small flat-bladed screwdriver, lever open the fuse panel to the right of the connector. At the right hand side is a vertical PCB with a plastic key which indicates the setting. Using pliers, pull out the PCB. The PCB has to be rotated until the desired voltage is shown along the edge which plugs into the module. The plastic key (and this bit is quite fiddly) must also be rotated so that it points out of the module and so that the round pin aligns with the appropriate hole in the cover panel; (refer to the diagrams below). v) Re-insert the PCB and replace the fuse panel. The plastic pin should project through the appropriate hole. 100V 120V 230V 240V Mains Input Module 100 240 120 120 100 240 230 120 230 240 230 240 100 100 100V Setting (Use for 90-105V) 120V Setting (Use for 105-125V) 230V Setting (Do not use) 240V Setting (Use for 220-240V) Mains Input Programming PCB These diagrams show the PCB arrangements for the different voltage settings. Note that if the mains voltage is a nominal 230V, the 240V Setting should be used not the 230V Setting! Page 6

Features 4. Features 4.1 Earth Lift Switch This switch is located on the rear panel. It isolates the circuit 0V from the Earth cable of the Mains Input Connector. The case and the lid are always connected to the Earth cable. If the unit is to be connected to an installation with a Mains Earth, then it may be necessary to operate the switch in order to eliminate hum caused by earth loops. 4.2 Remote Connector The rear panel REMOTE Connector allows the connection of an external gain reduction meter and Autofade switch and lamp. The diagram below shows the required connections. 5 4 3 2 1 9 8 7 6 REMOTE Remote Autofade Lamp (24 V.) Remote Autofade Switch (Latching) + - Remote Meter - SSL Part No. 42MDD7FR Page 7

XLogic G Series Compressor Owner s Manual 5. Connection Details The picture below identifies the PCBs and shows the locations of the various connectors which are referred to in this section. 82E347 Position of Safety Cover PL4 PL1 PL5 82E345 PL2 PL3 82E346 5.1 Connections from 82E345 Card to Front/Rear Panel The rear panel REMOTE connector allows the use of an external meter and/or AUTOFADE switch (see Page 5). The connector is a 9-way 'D'-type; at the PCB end is a 10-way ribbon connector, PL1. The meter connector, PL3, is a 5-way Molex type. Designations for each connector are as follows: PL1: 82E345 Main Card to REMOTE Connector on Rear Panel PL1 Pin Function 'REMOTE' Connector Pin 1 External Meter +ve 1 2 External Meter -ve 6 3 Ext. AUTO FADE Switch - A 2 4 Ext. AUTO FADE Switch - B 7 5 Ext. AUTO FADE Lamp - A 3 6 Ext. AUTO FADE Lamp - B 8 7 n/c 8 n/c 9 n/c 10 n/c Page 8

Connections PL3: 82E345 Main Card to Meter Pin Function 1 Meter +ve 2 Meter ve 3 Meter Backlight +ve 4 Meter Backlight ve 5 n/c 5.2 Inter-Card Connectors. There are two connectors in this category. PL2 is a 26-way ribbon connector, and interfaces the 82E346 Switch Card to the 82E345 Main Card. PL4, a 16-way ribbon connector, carries all of the audio signals between the 82E347 XLR Connector Card and the 82E345 Card. PL2: 82E345 Main Card to 82E346 Switch Card Pin Function Pin Function 1 THRESHOLD Pot CW 14 RATIO Switch Left 1:10 2 THRESHOLD Pot Wiper 15 MAKE-UP Pot CW 3 THRESHOLD Pot ACW 16 MAKE-UP Pot Wiper 4 Control Voltage In 17 MAKE-UP Pot ACW 5 Control Voltage Out 18 +18V 6 0V 19 18V 7 RATIO Switch Right Wiper 20 Compressor IN Switch/Lamp 8 RATIO Switch Right 1:2 21 Ext. Side-Chain IN Switch/Lamp 9 RATIO Switch Right 1:4 22 AUTOFADE Switch 10 RATIO Switch Right 1:10 23 AUTOFADE Lamp 11 RATIO Switch Left Wiper 24 AUTOFADE Pot CW 12 RATIO Switch Left 1:2 25 AUTOFADE Pot ACW & Wiper 13 RATIO Switch Left 1:4 26 n/c PL4: 82E345 Main Card to 82E347 XLR Connector Card Pin Function Pin Function 1 Right O/P +ve 9 Left I/P ve 2 Right O/P ve 10 Left I/P +ve 3 Right I/P ve 11 0V Left 4 Right I/P +ve 12 0V Left 5 0V Right 13 0V Key 6 0V Right 14 0V Key 7 Left O/P ve 15 Key I/P ve 8 Left O/P +ve 16 Key I/P +ve Page 9

XLogic G Series Compressor Owner s Manual 5.3 Power Connector to 82E345 Card This connector carries AC power from the transformer secondary to the 82E345 Main Card. PL5: A.C. to 82E345 Main Card Pin Function 1 Transformer Secondary - A 2 Transformer Secondary - 0V 3 Transformer Secondary - B 4 Reserved for future use 5 Reserved for future use Page 10

Circuit Description 6. Circuit Description Internally, the unit comprises three cards: 82E345 Main Card 82E346 Switch Card 82E347 XLR Connector Card The Power Supply circuitry is contained on the 82E345 Main Card, and is fed from a transformer mounted at the rear of the unit. Circuit descriptions for each of the PCB sub-assemblies follow. Circuit diagrams for each card are located immediately after the corresponding circuit description. 6.1 The 82E345 Main Card (Drgs. T82345.71-3, T0384G.71) This card contains (from left to right when viewed from the front of the unit) two identical compressor stages for right and left channels, control circuitry common to both channels, and the Power Supply circuitry. Compressor Circuitry The two compressor stages are identical, and component references for the right and left hand channels differ only in the use of an 'R' and 'L' suffix respectively. The diagram below shows the audio signal path in simplified form. The balanced input signal passes via input bypass relay RL1 through H1, providing an unbalanced output. This signal feeds the input of the main VCA, H2, via gain trim preset VR1. The output of H2 drives hybrid H3 to provide a balanced output which feeds via output bypass relay RL2. VR2-3 are used to set VCA symmetry and output signal balance respectively; these are factory set and should not require further adjustment. The sidechain VCA, H4, is fed with an unbalanced audio signal either from H1 (see above) via TR1 or from the rear panel KEY connector via H5 and TR2, dependent upon the setting of the External Sidechain IN switch. The output of H4 is buffered by IC1. Audio Input RL1 H1 H2 H3 RL2 Audio Output Ext. Sidechain Audio Input H5 IN Main VCA Control (see next page) H4 IC1 To RATIO circuitry (IC2/3) (see next page) Sidechain VCA Control (see next page) Page 11

XLogic G Series Compressor Owner s Manual Compressor Control Circuitry Most of the control circuitry is common to both right and left hand channels. The diagram below shows the control signal path in simplified form. From Sidechain VCA Buffer (IC1) (see previous page) THRESHOLD Control IC54 Sidechain VCA Control (see previous page) RATIO cctry. IC2/3 ATTACK/ RELEASE circuitry IC53 Meter Output AUTO FADE circuitry IC50/ 51/52/63 MAKEUP Control IC55 Main VCA Control (see previous page) The output from the sidechain VCA buffer IC1 (see previous page) drives the Ratio circuitry based around IC2-3. This is essentially a precision rectifier circuit whose limits of linear operation may be altered by switching different voltages (derived from potential divider network R29-35) into the inverting input of IC3 via the RATIO switch. The output from IC3 is then fed to the Attack/Release circuitry. The resulting signal is finally buffered by IC53, and is used to drive the meter directly. This signal is available on the REMOTE connector, allowing a similar external meter to be driven. See Section 4 for details of a suitable meter. The Autofade circuitry generates a variable rate voltage change (with a sharper 'knee' characteristic towards the end). When AUTOFADE is pressed, the output of IC58 goes low, causing the output of IC63 to go high. C54 thus begins to charge via the AUTOFADE pot and R61, causing the output of IC63 to gradually fall. This will affect the VCA Control Voltages after D54 is biased on. When C54 is sufficiently charged, IC63 switches low. Overall Gain Trim is provided by VR50. IC54-55 act as summing amplifiers to produce the Sidechain and Main VCA Control Voltages respectively. IC54 sums the signals from IC53 (see above) and the THRESHOLD control, and IC55 sums the signals from IC53, the MAKEUP control, and from the Autofade circuitry output from IC52 (see above). The outputs of IC54-55 drive the control inputs of H2 and H4 respectively (see previous page). If LK5 is inserted, VR4 can be used to adjust VCA tracking between left and right channels. Both 'hard' and 'soft' bypass options are available, configuration being via LK1 and LK2. (The required link positions for either option are clearly identified on the PCB.) In 'hard' bypass mode, when either the Compressor is not IN or power fails, the audio signal bypasses the compressor via relays RL1-2. In 'soft' bypass mode, switching the Compressor IN switch off isolates all VCA control voltages and the external sidechain audio path via TR57-58 and TR3, reducing the unit function to that of a unitygain amplifier. Note: With the compressor in 'soft' bypass, the AUTOFADE facility remains available. Page 12

Circuit Description Power Supply The Power Supply comprises a primary regulator stage which produces +18V and -18V dc. lines, and secondary regulator stages, fed from these lines, which provide the various circuit voltage supplies. The nominal 40V ac. from the centre-tapped secondary of T1 is rectified by D61-64. The +ve and -ve outputs from this bridge rectifier (referenced to the centre tap of T1) feed regulators IC56 and IC57 respectively to produce +18V and 18V lines from which all the circuit voltage supplies are derived. Briefly, these are as follows: Regulators IC58 and IC59 are fed by the ±18V lines and provide outputs of ±12V which are used for the RATIO switch resistor chains. Regulators IC60 and IC61 are also fed by the ±18V lines. These provide outputs of ±15V which power the VCA circuitry. Supplies of ±18V for the control circuitry are decoupled from the main ±18V lines by R110-111 and C72-75. A further supply of +11V is derived from the +18V line via D74 and R112 and constitutes the negative supply for the logic circuitry. The ±18V analog supplies are decoupled from the main ±18V lines by R113-114 and C84-85. Details of the transformer and operating voltage selection circuitry are shown on drawing T0384G.71. Page 13

XLogic G Series Compressor Owner s Manual Title Date 82E345 MAIN CARD SILK SCREEN 19 FEB 1990 Solid State Logic Page 14

Add schematics for T82345 and T0384G in place of this sheet

Circuit Description 6.2 The 82E346 Switch Card (Drg. T82346.71) This card carries the ATTACK and RELEASE switches, SW1 and SW3, with their associated RC networks which alter the Attack and Release characteristics by modifying the VCA Control Voltage. The card also carries the RATIO switch, SW2, and the THRESHOLD, MAKEUP, and AUTOFADE potentiometers, VR1, VR2, and VR3 respectively. The Compressor and External Sidechain IN switches and the AUTO FADE switch connect to this card via flying leads. An RC network is provided for each switch to ensure a smooth switchover characteristic. Connection to the 82E345 Main Card is via PL2. Page 15

XLogic G Series Compressor Owner s Manual Title 82E346 SWITCH CARD SILK SCREEN Date Solid State Logic Page 16

Add schematic for T82346 in place of this sheet

Circuit Description 6.3 The 82E347 XLR Connector Card (Drg. T82347.71) The five rear panel XLR connectors are mounted on this card together with a 16-way ribbon connector, PL4. The card functions purely as an interface for the XLR connectors. Page 17

XLogic G Series Compressor Owner s Manual This page intentionally left nearly blank. Page 18

Add schematic for T82347 in place of this sheet

Parts List 7. Component List The major components of the XLogic Stereo Compressor are listed below, together with their respective SSL Part Numbers and, where appropriate, an indication of where each component is used. Part No. Description Reference 32K09PB5 CON RIBBON 9W D CHASSIS SOCKET REAR PANEL 32K10GB5 CON RIBBON 10W FREE SOCKET MAIN CARD 32K10GGX STRAIN RELIEF - 10W RIBBON SKT MAIN CARD 32K168B5 CON RIBBON 16W PC HEADER RT LP PL4 ON XLR CARD 32K16GB4 CON RIBBON 16W FREE SOCKET MAIN & XLR CARDS 32K16GGV STRAIN RELIEF - 16W RIBBON SKT MAIN & XLR CARDS 32K26GB4 CON RIBBON 26W FREE SOCKET MAIN/SWITCH CARDS 32K26GGV STRAIN RELIEF - 26W RIBBON SKT MAIN/SWITCH CARDS 32PD03BE CON XLR 3W PC CHASSIS PLUG L AND R O/Ps 32PD03CE CON XLR 3W PC CHASSIS SOCKET L, R AND KEY I/Ps 32PMXXUQ 9W D CONNECTOR CHASSIS SCREW LOCK REAR PANEL 32Q805LC CON MOLEX 6471 5 WAY SKT SHELL MAIN CARD TO METER 32Q8XXQ1 MOLEX SOCKET INSERT METER 32Q907LC CON MOLEX 7 WAY FREE SKT SHELL MAIN CARD 32Q9X0LL POLARISING KEY MOLEX 0.156" 32Q9XXQ3 CON MOLEX SOCKET INSERT 0.156" 32VGJ36D CON IEC CHPL FIL/SL/FS/SW RT REAR PANEL 33DMK118 PUSHBUTTON SQ SP LATCH GREY FRONT PANEL 33FCD22C SWITCH SLIDE 2PC0 4A 250V REAR PANEL 34B153F8 KNOB RND 15mm X 1/8 LINE GREY FRONT PANEL (VR1-3) 34B154F8 KNOB RND 15mm X 4mm LINE GREY FRONT PANEL (SW1-3) 34B15FF8 KNOB CAP 15mm LINE GREY FRONT PANEL 35FJJ250 FUSE 1 1/4" ANTI - SURGE 500mA FUSE FOR IEC CON 36EGDDDC TFMR 100/120/240 20-0 - 20 40VA CHASSIS 413TAT3X LAMP FILTER T5.5 AMBER LAMPS ON P/Bs 41CPAT9J LAMP T5.5 24V 30mA P/B SWITCHES 42MDT7F4 METER DB COMPRESSION 14 LED ILLUM FRONT PANEL 53783381 PLATE - MAINS PROTECTION 53784371 PANEL FRONT - LOGIC FXG384 (SATIN SILVER) 53784311 PANEL REAR - LOGIC FXG384 53784321 CHASSIS - LOGIC FXG384 53784341 INSULATOR POLYCARB FX384 FIT UNDER 82E345 53784361A FRONT PANEL TO CASE BRACKET FRONT PANEL - FX384 6082347EA PCB FX384 XLR CARD 622345E1 S/A FX384 MAIN CARD 622346E1 S/A FX384 UPPER SWITCH CARD 66B4D036 PUSHBTN SWITCHES HIGHLAND SQ WHITE "IN" FRONT PANEL 66B4D064 PUSHBTN SWITCH HIGHLAND SQ WHITE "AUTO FADE" FRONT PANEL Page 19

XLogic G Series Compressor Owner s Manual This page intentionally left nearly blank. Page 20